2 nd Term Final. Revision Sheet. Students Name: Grade: 10 A/B. Subject: Physics. Teacher Signature

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1 2 nd Term Final Revision Sheet Students Name: Grade: 10 A/B Subject: Physics Teacher Signature 1

2 NAME: GRADE: 10 MULTIPLE CHOICES PHYSICS WORKSHEET In the space provided, write the letter of the term or phrase that best completes each statement or best answers each question. 1. Sound waves a. are a part of the electromagnetic spectrum. b. do not require a medium for transmission. c. are longitudinal waves. d. are transverse waves. 3. Which of the following is the region of a sound wave in which the density and pressure are greater than normal? a. rarefaction c. amplitude b. compression d. wavelength 4. The highness or lowness of a sound is perceived as a. compression. c. ultrasound. b. wavelength. d. pitch. 5. Pitch depends on the of a sound wave. a. frequency c. power b. amplitude d. speed 6. In general, sound travels faster through a. solids than through gases. b. gases than through solids. c. gases than through liquids. d. empty space than through matter. 7. When two transverse waves traveling through a medium meet and exactly coincide, the resulting displacement of the medium a. is the sum of the displacements of each wave. b. is zero. c. is always greater than the displacement of either wave alone. d. is always destructive. 8. When two waves having displacements in opposite directions meet, occurs. a a. complete cancellation b. no interference c. constructive interference d. destructive interference 9. Two waves meet and interfere constructively. Which one of the following factors increases? a. period b. amplitude c. frequency d. wavelength 2

3 10. When a wave on a rope strikes a free boundary, the wave is a. reflected and inverted. c. not reflected. b. reflected but not inverted. d. absorbed. 11. A sound wave is an example of a(n) wave. a. transverse b. longitudinal c. crest-and-trough d. electromagnetic 12. A sound wave consists of a series of a. compressions and rarefactions. b. longitudes and latitudes. c. hills and valleys. d. perpendicular vibrations 13. The human perception of pitch depends on a sound s a. velocity. b. wavelength. c. frequency. d. amplitude. 14. Sound generally travels faster through solids than through gases because the particles (atoms or molecules) of a solid are than the particles of a gas. a. closer together b. heavier c. warmer d. larger 15. Sound waves from a vibrating source travel a. in one direction. b. in two directions. c. in all directions. d. back and forth. 16. Spherical wave fronts can be treated as parallel lines when a. they are very near the source. b. the frequency is very high. c. the wavelength is very large. d. they are a large distance from the source. 17. When you hear the sound from a vehicle that is moving toward you, the pitch is higher than it would be if the vehicle were stationary. The pitch sounds higher because the a. sound waves arrive more frequently. b. sound from the approaching vehicle travels faster. c. wavelength of the sound waves becomes greater. d. amplitude of the sound waves increases. 18. Suppose you are on a moving bus as it passes a stationary car in which a stereo is playing music. As the bus goes past the car, you will hear the pitch of the music a. become higher. b. become lower. c. remain constant. d. become lower, then higher. 3

4 SHORT ANSWER 1.The of a musical sound determines its pitch. 2.Unlike a transverse wave on a rope, sound travels as a(n) wave. _ 3.What happens to pitch when the frequency of a sound wave increases? 4. Two waves traveling in the same medium are approaching each other. What determines whether constructive or destructive interference occurs when the waves meet and coincide? PROBLEM 1. A wave on a guitar string has a velocity of 684 m/s. The guitar string is 62.5 cm long. What is the fundamental frequency of the vibrating string? 2. The speed of sound in sea water is about 1530 m/s. If a sound wave has a frequency of Hz, what is its wavelength in sea water? 3. Cicadas produce a sound that has a frequency of 123 Hz. What is the wavelength of this sound in the air? The speed of sound in air is 334 m/s. 4

5 4. Human fingers are very sensitive, detecting vibrations with amplitudes as low as m. Consider a sound wave with a wavelength exactly 1000 times greater than the lowest amplitude detectable by fingers. What is this wave s frequency? 5. Earthquakes also produce transverse waves that move more slowly than the p-waves. These waves are called secondary waves, or s-waves. If the wavelength of an s-wave is m, and its frequency is Hz, what is its speed? 6. A dolphin can hear sounds with frequencies up to 280 khz. What is the speed of sound in water if a wave with this frequency has a wavelength of 0.51 cm? 7. Waves in a lake are 6.0 m apart and pass a person on a raft every 2.0 s. What is the speed of the waves? 5

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